Amphitheater in Apra Harbor, Guam, is a reef and wall site defined by its natural curvature and significant drop-off. Divers can explore depths ranging from 9 to 40 metres. The site features deep water corals along the wall structure. Visibility is generally good, typically ranging from 18 to 61 metres. Access is by boat only, and the site is suited for advanced divers due to the potential for moderate currents, deep water, and surf conditions. Species recorded around this area include various wrasses, pufferfish, butterflyfish, lionfish, and trevally, though these are not confirmed sightings at this specific location.

Piti Bomb Hole in Apra Harbor is a shallow reef site accessible via a shore entry. Located 69 metres from the shore, the site features an average depth of 8 metres, with a range between 5 and 11 metres. Conditions are generally mild with visibility ranging from 10 to 30 metres. The site is suitable for beginners and those seeking a refresher dive. Divers can observe a variety of marine life, including common wrasses and Pacific doublesaddle butterflyfish. Less frequently encountered species include emperor angelfish, Napoleon wrasse, titan triggerfish, snowflake moray, longhorn cowfish, Indian lionfish, day octopus, regal angelfish, Brummer's moray, rock cod, masked bannerfish, and blackback anemonefish.

Fish Eye in Apra Harbor features a combination of natural reef and artificial structures accessible via a shore entry. The site is suitable for beginners, with depths ranging from 1 to 12 metres and an average depth of 8 metres. Divers and snorkellers experience mild currents and visibility between 6 and 10 metres. Water temperatures remain consistent between 28 and 30 degrees Celsius throughout the year. Facilities at the location include parking, toilets, and a cafe. Due to active boat traffic in the harbour, divers should maintain high situational awareness and deploy a surface marker buoy during ascents.

SMS Cormoran is a German merchant raider scuttled in 1917, resting in Apra Harbor at depths between 12 and 40 metres. The wreck lies alongside the Tokai Maru, with both vessels accessible to divers at a depth of approximately 29 metres. This site is reserved for advanced divers due to the overhead environment, potential for nitrogen narcosis, and deep water. Visibility ranges from 6 to 37 metres, and moderate currents are common. Access is strictly by boat, and divers must remain vigilant regarding boat traffic in the harbour. Water temperatures remain consistent throughout the year, typically between 28 and 30 degrees Celsius.

OutHouse Beach in Apra Harbor is a versatile shore entry site featuring both natural reef and artificial reef structures. Suitable for beginners, the site offers depths ranging from 3 to 18 metres with an average of 10 metres. Divers and snorkellers should be aware of moderate currents, boat traffic, and potential hazards including sharp coral and stonefish. Visibility typically fluctuates between 7 and 12 metres. The site is accessible for night diving, with typical dives lasting around 45 minutes. Facilities at the location include toilets. Water temperatures remain warm throughout the year, ranging from 28 to 30 degrees Celsius.

The Tokai Maru is a WWII Japanese freighter resting on its port side in Apra Harbor. Sunk on 27 August 1943, the wreck lies at depths between 15 and 40 metres, with an average depth of 25 metres. It is notable for resting against the SMS Cormoran, allowing divers to touch both a WWI and WWII wreck simultaneously. Access is by boat only, located 1500 metres from shore. Divers encounter common species including pufferfish, wrasses, cardinalfish, soldierfish, and hermit crabs, alongside less frequent sightings of butterflyfish, triggerfish, and various sea stars. Due to the depth and overhead environment, this site is strictly for advanced divers.

The Kitsugawa Maru is a freighter sunk in July 1944 that sits upright in Apra Harbor. The wreck remains approximately 80 percent intact, featuring a large bow gun and masts that begin at 18 metres. Divers can expect depths ranging from 15 to 42 metres, with an average of 27 metres. This boat-only dive is suited for advanced divers due to the depth and overhead environment. Visibility varies between 4 and 20 metres, and moderate currents are common. Marine life frequently recorded at the site includes pufferfish and wrasses, alongside less common species such as Pacific doublesaddle butterflyfish, threadfin butterflyfish, flagtail triggerfish, and blackback anemonefish.

Western Shoals is a sloping reef located within Apra Harbor, Guam. This site is suitable for beginners and offers a depth range of 3 to 27 metres, with an average depth of 10 metres. Divers typically spend 45 minutes exploring the reef, which features healthy coral growth. Access to the site is by boat only. Conditions are generally mild, with visibility ranging from 9 to 30 metres and water temperatures between 28C and 30C throughout the year. Due to the location, divers should remain aware of boat traffic in the area.